Lathe



Nov. 22; 1932. OTTRELL, 30 1,888,792

LATHE Filed April 24. 1930 2 Sheets-Sheet l 8 INVENTOR My/W 3 ATTORNEYS Nov. 22, 1932.

- C. B. COTTRELL, 3D

LATHE Fild April 24. 1950 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Fntented Nov. 22, 1932 ,sssez;

do SUNS GOHPAINY, 03 WESTERLY, RHODE ISLAND, AICQBPGBATIQN OF DELAWARE LATHE llhe object oil my invention is to produce certein improvements in a turning lathe, whereh the cutters mey he revolved around the wor at high surface speeds without chattering or vihretionn My invention comprises e cutter holder rotetebly mounted on the lathe cerriege, in which holder one or more circular series of cutters are mounted, and means, us on electric motor mounted on the cerriege end having e belt drive connection with the cutter holder is provided tor revolving the cutters repidly around the worlr.

, My invention further comprises means for importing To relative ieeding movement to the holder end work, said means in the present instance being shown es an electric motor for feeding the lathe carriage with its tool holder, heck and forth elong the work. i

My invention still further comprises means, es on electric motor, for slowly rotating the worlr in the opposite direction from that in which the cutters ere heing rapidly revolved, thereby ensuring e perfectly round cutting oithe work,

invention is particularly designed for turning down she'lts lay the useot cutters of high speed materiel us, for instance, tungsten carbide,

A practical emhodirnent of my invention is represented in the accompanying drawings, in which l Fig. 1 represents my improved lethe in top plan with e shaft held therein and engeged by the revolving cutters;

Fig. 2 represents u side elevation of the some 3 Fig. 3 represents a transverse vertical section token in the plane of the line lll-lll of Fig, 2; 4 i

Fig. i represents at detail longitudinal section, on an enlarged scale, taken in the plane the line llV-lV of Fig. 6, looking in the direction of the errows;

I Fig. 5 represents e'deteil longitudinal sec- 1930. finial K0 $46,895.

GALVERT B. CGTTBELL, 3D, 03 WESTERLY, BHODE ISL, ABSIGINQR T0 0, B. COTTBELI:

(I-VI or Fig. 4-, looking in the direction of the arrows; end

Fig, 7 represents e transverse section token in the plane of the line VlL-Wll" of Fig. looking in the direction of the urrows.

The bed ofthe lathe is denoted hr 1', on which loed are mounted the head stoch 2, the tail stock and the lethe carriage 45., head stock 2 is provided with e rotetelole live center 5 for driving engagement with one end of the work thwhich, 1n the present instance, is represented use The toil stock 3 which is edjustuhle longitudinelly along the hed is shown es provided with u, leterelly rnovehle member in which is rotetehly mounted the deed center 8 for engauging the other end of the worl: Bell thrust heerings 9 end l0 rosy he provided "for the live end deed centers, it so'desired,

The means which ll hove shown for rotet= inn; the worli t5 slowly in one direction com prises on electric motor ll mounted on the head stock 2, the shaft of which motor is pro vided with a worm 12 which meshes with e worm wheel 13, lost on the shed; oi the live center 5.

The ineens for interlocking the live center 5 with the work =5, to ensure the rotstion of the work with the live center, is herein shown es. s collar it on the shelt of the live center, said collar having prongs l5 entering the end of the work within its periphery to permit the cutters to he run oil? the worlr at the live center as well es et the deed center,

Thev cutter holder which surrounds the work 6 is rotetehly mounted in the lathe cor rings 4 end, in the present instance, thrust hearings it, end 1'? ere provided he tween the cutter holder end the cerriegge, This cutter holder, in the present instence, is shown us comprising e hollow huh section 18 and two end tlenges 19 end 2d, to the outer The did

:t'eces oil which flanges are secured the two 25 and a circular series oi work supports 26%.

There are three of the cutters end three ot the work supports shown curried hy each of the plates, The cutters are adjustable toward and away from the work along grooves 27 in the plates, by suitable adjusting screws 28 and may be secured in their adjusted positions by the clamp screws 29. The work supports 26 are adjustable toward and away from the work in' grooves 30 in said plates, by

suitable adjusting screws 31 and may be seing the cutters at high surface speed around the work is herein shown as comprising a high speed electric motor 33, mounted on the lathe carriage 4; the motor shalt pulley 34 having a double belt driving connection 35 with a pulley 36 keyed to the hub 18 of the cutter holder.

The means which l have shown for feed ing the lathe carriage 4 back and forth along the work is herein shown as comprising a longitudinally disposed screw 37 rotatably mounted at its ends in suitable bearings 38, 39 and having a screw threaded engagement with the carriage, as is usual, said screw being driven in the present instance in either direction as required, by a reversible electric motor 40, mounted on the lathe frame and having a reduction gear driving connection ll, with the adjacent end of the screw 3'? beyond the bearing 38.

By providing a belt drive connection between the electric motor 33 and the cutter holder, the cutters may be revolved at high speeds around the work without chatter or vibration, thereby permitting the cutters to be made of very high speed material such, for instance, as tungsten carbide, without danger oi the said cutting material becoming disintegrated.

By causing the electric motor ll to rotate the work slowly in the opposite direction from that in which the cutters are revolving, I am enabled to ensure a perfectly round turning of the work as well as increasing the relative surface speed of the cutters with respect to the work. Furthermore, by providing a reversible electric motor drive for the lathe carriage re ciprocating screw, it am enabled to accurately control the feeding speed of the carriage along the work in either direction for obtaining the best results. i

The provision of the work supports alternating with the cutters around the work eliminates any tendency of the. work to spring away from the cutters.

By providing two circular series of cutters in the cutter holder the time with which the work may be cut to the desired diameter is materially reduced.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, and hence I do not intend to limit myself to the particular embodiment herein shown and described, but

What I claim is 1. In a turning lathe, cutters, their holder,

an electric motor having a belt drive connection with the holder for revolving the cutters rotating the work in the opposite direction, and means for imparting a relative feeding movement of the holder and work.

2. In a turning lathe, cutters, their holder,

in one direction around the work, means for an electric motor having a belt drive connection with the holder for revolving the cutters in one direction aroundthe work, means for rotating the work in the opposite direction,

and means for feeding the holder along the work.

3. In a turning lathe, a bed, a traveling carriage, cutters, their holder rotatably mounted on the carriage, means mounted on the carriage for rotating the holder to revolve the cutters in one direction around the work,

means for rotating the work in the opposite direction, and means for feeding the carriage along the work.

4:. In a turning lathe, a bed, a traveling carriage, cutters, their holder rotatably mounted on the carriage, an electric motor mounted on the carriage and having a belt drive connection with the tool holder for revolving the cutters in one direction around the work, means for rotating the work in the opposite direction, and means for moving the carriage along the work.

5. In a turning lathe, a bed, a traveling carriage, cutters, their holder rotatably Nil mounted on the carriage, an electric motor mounted on the carriage for rotating the holder to revolve the cutters in one direction around the work, an electric motor for rotat-.

ing the work in the opposite direction, and an electric motor for feeding the carriage along the work.

6. In a turning lathe, a bed, a traveling carriage, cutters, their holder rotatably holder to revolve the cutters in one direction V carriage, cutters, their holder rotatably around the work, a head stock and its live center, a tail stock and its dead center, an Y electric motor operatively connected to the live center for rotating the work in the o posite direction, and an electric motor for eeding the tool holder along its work.

8. In a turning lathe, a, bed, a traveling mounted on the carriage, an electric motor mounted on the carriage and having a belt drive connection with the tool holder for revolving the cutters in one direction around the work, a head stock and its live center, a tail stock and its dead center, an electric motor operetivel connected to the live'center for rotating t e work in the opposite direction, and an electric motor for feeding the tool holder along its Work.

In testimony, that Iclaim the foregoing as my invention, I have signed my name this 18 th day of April, 1930.

CALVERT B. GOTTRELL, 3n. 

